1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Wrapper functions for 16bit uid back c 3 * Wrapper functions for 16bit uid back compatibility. All nicely tied
4 * together in the faint hope we can take 4 * together in the faint hope we can take the out in five years time.
5 */ 5 */
6 6
7 #include <linux/mm.h> 7 #include <linux/mm.h>
8 #include <linux/mman.h> 8 #include <linux/mman.h>
9 #include <linux/notifier.h> 9 #include <linux/notifier.h>
10 #include <linux/reboot.h> 10 #include <linux/reboot.h>
11 #include <linux/prctl.h> 11 #include <linux/prctl.h>
12 #include <linux/capability.h> 12 #include <linux/capability.h>
13 #include <linux/init.h> 13 #include <linux/init.h>
14 #include <linux/highuid.h> 14 #include <linux/highuid.h>
15 #include <linux/security.h> 15 #include <linux/security.h>
16 #include <linux/cred.h> 16 #include <linux/cred.h>
17 #include <linux/syscalls.h> 17 #include <linux/syscalls.h>
18 18
19 #include <linux/uaccess.h> 19 #include <linux/uaccess.h>
20 20
21 #include "uid16.h" 21 #include "uid16.h"
22 22
23 SYSCALL_DEFINE3(chown16, const char __user *, 23 SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
24 { 24 {
25 return ksys_chown(filename, low2highui 25 return ksys_chown(filename, low2highuid(user), low2highgid(group));
26 } 26 }
27 27
28 SYSCALL_DEFINE3(lchown16, const char __user *, 28 SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
29 { 29 {
30 return ksys_lchown(filename, low2highu 30 return ksys_lchown(filename, low2highuid(user), low2highgid(group));
31 } 31 }
32 32
33 SYSCALL_DEFINE3(fchown16, unsigned int, fd, ol 33 SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
34 { 34 {
35 return ksys_fchown(fd, low2highuid(use 35 return ksys_fchown(fd, low2highuid(user), low2highgid(group));
36 } 36 }
37 37
38 SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, o 38 SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
39 { 39 {
40 return __sys_setregid(low2highgid(rgid 40 return __sys_setregid(low2highgid(rgid), low2highgid(egid));
41 } 41 }
42 42
43 SYSCALL_DEFINE1(setgid16, old_gid_t, gid) 43 SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
44 { 44 {
45 return __sys_setgid(low2highgid(gid)); 45 return __sys_setgid(low2highgid(gid));
46 } 46 }
47 47
48 SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, o 48 SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
49 { 49 {
50 return __sys_setreuid(low2highuid(ruid 50 return __sys_setreuid(low2highuid(ruid), low2highuid(euid));
51 } 51 }
52 52
53 SYSCALL_DEFINE1(setuid16, old_uid_t, uid) 53 SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
54 { 54 {
55 return __sys_setuid(low2highuid(uid)); 55 return __sys_setuid(low2highuid(uid));
56 } 56 }
57 57
58 SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, 58 SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
59 { 59 {
60 return __sys_setresuid(low2highuid(rui 60 return __sys_setresuid(low2highuid(ruid), low2highuid(euid),
61 low2highuid(s 61 low2highuid(suid));
62 } 62 }
63 63
64 SYSCALL_DEFINE3(getresuid16, old_uid_t __user 64 SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp)
65 { 65 {
66 const struct cred *cred = current_cred 66 const struct cred *cred = current_cred();
67 int retval; 67 int retval;
68 old_uid_t ruid, euid, suid; 68 old_uid_t ruid, euid, suid;
69 69
70 ruid = high2lowuid(from_kuid_munged(cr 70 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
71 euid = high2lowuid(from_kuid_munged(cr 71 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
72 suid = high2lowuid(from_kuid_munged(cr 72 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
73 73
74 if (!(retval = put_user(ruid, ruidp) 74 if (!(retval = put_user(ruid, ruidp)) &&
75 !(retval = put_user(euid, euidp) 75 !(retval = put_user(euid, euidp)))
76 retval = put_user(suid, suidp) 76 retval = put_user(suid, suidp);
77 77
78 return retval; 78 return retval;
79 } 79 }
80 80
81 SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, 81 SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
82 { 82 {
83 return __sys_setresgid(low2highgid(rgi 83 return __sys_setresgid(low2highgid(rgid), low2highgid(egid),
84 low2highgid(s 84 low2highgid(sgid));
85 } 85 }
86 86
87 SYSCALL_DEFINE3(getresgid16, old_gid_t __user 87 SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
88 { 88 {
89 const struct cred *cred = current_cred 89 const struct cred *cred = current_cred();
90 int retval; 90 int retval;
91 old_gid_t rgid, egid, sgid; 91 old_gid_t rgid, egid, sgid;
92 92
93 rgid = high2lowgid(from_kgid_munged(cr 93 rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
94 egid = high2lowgid(from_kgid_munged(cr 94 egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
95 sgid = high2lowgid(from_kgid_munged(cr 95 sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
96 96
97 if (!(retval = put_user(rgid, rgidp) 97 if (!(retval = put_user(rgid, rgidp)) &&
98 !(retval = put_user(egid, egidp) 98 !(retval = put_user(egid, egidp)))
99 retval = put_user(sgid, sgidp) 99 retval = put_user(sgid, sgidp);
100 100
101 return retval; 101 return retval;
102 } 102 }
103 103
104 SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid) 104 SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
105 { 105 {
106 return __sys_setfsuid(low2highuid(uid) 106 return __sys_setfsuid(low2highuid(uid));
107 } 107 }
108 108
109 SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid) 109 SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
110 { 110 {
111 return __sys_setfsgid(low2highgid(gid) 111 return __sys_setfsgid(low2highgid(gid));
112 } 112 }
113 113
114 static int groups16_to_user(old_gid_t __user * 114 static int groups16_to_user(old_gid_t __user *grouplist,
115 struct group_info *group_info) 115 struct group_info *group_info)
116 { 116 {
117 struct user_namespace *user_ns = curre 117 struct user_namespace *user_ns = current_user_ns();
118 int i; 118 int i;
119 old_gid_t group; 119 old_gid_t group;
120 kgid_t kgid; 120 kgid_t kgid;
121 121
122 for (i = 0; i < group_info->ngroups; i 122 for (i = 0; i < group_info->ngroups; i++) {
123 kgid = group_info->gid[i]; 123 kgid = group_info->gid[i];
124 group = high2lowgid(from_kgid_ 124 group = high2lowgid(from_kgid_munged(user_ns, kgid));
125 if (put_user(group, grouplist+ 125 if (put_user(group, grouplist+i))
126 return -EFAULT; 126 return -EFAULT;
127 } 127 }
128 128
129 return 0; 129 return 0;
130 } 130 }
131 131
132 static int groups16_from_user(struct group_inf 132 static int groups16_from_user(struct group_info *group_info,
133 old_gid_t __user *grouplist) 133 old_gid_t __user *grouplist)
134 { 134 {
135 struct user_namespace *user_ns = curre 135 struct user_namespace *user_ns = current_user_ns();
136 int i; 136 int i;
137 old_gid_t group; 137 old_gid_t group;
138 kgid_t kgid; 138 kgid_t kgid;
139 139
140 for (i = 0; i < group_info->ngroups; i 140 for (i = 0; i < group_info->ngroups; i++) {
141 if (get_user(group, grouplist+ 141 if (get_user(group, grouplist+i))
142 return -EFAULT; 142 return -EFAULT;
143 143
144 kgid = make_kgid(user_ns, low2 144 kgid = make_kgid(user_ns, low2highgid(group));
145 if (!gid_valid(kgid)) 145 if (!gid_valid(kgid))
146 return -EINVAL; 146 return -EINVAL;
147 147
148 group_info->gid[i] = kgid; 148 group_info->gid[i] = kgid;
149 } 149 }
150 150
151 return 0; 151 return 0;
152 } 152 }
153 153
154 SYSCALL_DEFINE2(getgroups16, int, gidsetsize, 154 SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
155 { 155 {
156 const struct cred *cred = current_cred 156 const struct cred *cred = current_cred();
157 int i; 157 int i;
158 158
159 if (gidsetsize < 0) 159 if (gidsetsize < 0)
160 return -EINVAL; 160 return -EINVAL;
161 161
162 i = cred->group_info->ngroups; 162 i = cred->group_info->ngroups;
163 if (gidsetsize) { 163 if (gidsetsize) {
164 if (i > gidsetsize) { 164 if (i > gidsetsize) {
165 i = -EINVAL; 165 i = -EINVAL;
166 goto out; 166 goto out;
167 } 167 }
168 if (groups16_to_user(grouplist 168 if (groups16_to_user(grouplist, cred->group_info)) {
169 i = -EFAULT; 169 i = -EFAULT;
170 goto out; 170 goto out;
171 } 171 }
172 } 172 }
173 out: 173 out:
174 return i; 174 return i;
175 } 175 }
176 176
177 SYSCALL_DEFINE2(setgroups16, int, gidsetsize, 177 SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
178 { 178 {
179 struct group_info *group_info; 179 struct group_info *group_info;
180 int retval; 180 int retval;
181 181
182 if (!may_setgroups()) 182 if (!may_setgroups())
183 return -EPERM; 183 return -EPERM;
184 if ((unsigned)gidsetsize > NGROUPS_MAX 184 if ((unsigned)gidsetsize > NGROUPS_MAX)
185 return -EINVAL; 185 return -EINVAL;
186 186
187 group_info = groups_alloc(gidsetsize); 187 group_info = groups_alloc(gidsetsize);
188 if (!group_info) 188 if (!group_info)
189 return -ENOMEM; 189 return -ENOMEM;
190 retval = groups16_from_user(group_info 190 retval = groups16_from_user(group_info, grouplist);
191 if (retval) { 191 if (retval) {
192 put_group_info(group_info); 192 put_group_info(group_info);
193 return retval; 193 return retval;
194 } 194 }
195 195
196 groups_sort(group_info); 196 groups_sort(group_info);
197 retval = set_current_groups(group_info 197 retval = set_current_groups(group_info);
198 put_group_info(group_info); 198 put_group_info(group_info);
199 199
200 return retval; 200 return retval;
201 } 201 }
202 202
203 SYSCALL_DEFINE0(getuid16) 203 SYSCALL_DEFINE0(getuid16)
204 { 204 {
205 return high2lowuid(from_kuid_munged(cu 205 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
206 } 206 }
207 207
208 SYSCALL_DEFINE0(geteuid16) 208 SYSCALL_DEFINE0(geteuid16)
209 { 209 {
210 return high2lowuid(from_kuid_munged(cu 210 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
211 } 211 }
212 212
213 SYSCALL_DEFINE0(getgid16) 213 SYSCALL_DEFINE0(getgid16)
214 { 214 {
215 return high2lowgid(from_kgid_munged(cu 215 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
216 } 216 }
217 217
218 SYSCALL_DEFINE0(getegid16) 218 SYSCALL_DEFINE0(getegid16)
219 { 219 {
220 return high2lowgid(from_kgid_munged(cu 220 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
221 } 221 }
222 222
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